JPWO2020255422A5

JPWO2020255422A5 -

Info

Publication number: JPWO2020255422A5
Application number: JP2021528640A
Authority: JP
Filing date: 2019-06-21
Publication date: 2022-04-04
Anticipated expiration: 2039-06-21

Description

無線基地局100, 110の各々は、gNB又はeg-eNBであり、Next Generation-Radio Access Network（NG-RAN、不図示）に含まれる。NG-RANは、NRに従ったコアネットワーク（5GC、不図示）と接続される。なお、NG-RAN及び5GCは、単に「ネットワーク」と表現されてもよい。 Each of the radio base stations 100 and 110 is a gNB or eg-eNB and is included in the Next Generation-Radio Access Network (NG-RAN, not shown). N G -RAN is connected to the core network (5GC, not shown) according to NR. In addition, NG-RAN and 5GC may be simply expressed as "network".

受信部220は、PCell及びSCellの各々で設定された下りリンクを用いて、下りリンク信号を受信する。例えば、受信部220は、SCellにおいて、ビーム障害検出用の参照信号RS1～RS7及び新規ビーム候補決定用の参照信号を受信する。受信部220は、切り替え先の新規ビームへの設定変更を有するTCI stateを含んだRRCメッセージを受信する。 The receiving unit 220 receives the downlink signal by using the downlink set in each of PCell and SCell. For example, the receiving unit 220 receives the reference signals RS1 to RS7 for beam fault detection and the reference signals for determining a new beam candidate in the SCell. The receiving unit 220 receives an RRC message including a TCI state having a setting change to a new beam to be switched to.

（３）無線通信システムの動作
次に、BFR手順における無線通信システム10の動作について説明する。具体的には、(1)ビーム障害を検出する場合における端末200の動作、(2)BFR要求を行う場合における端末200の動作、(3)BFR完了を判定する場合における端末200の動作、(4)BFR手順が失敗した場合における端末200の動作、及び(5)複数のSCellにおいてビーム障害の検出を同時に行う場合における端末200の動作について説明する。 (3) Operation of wireless communication system Next, the operation of wireless communication system 10 in the BFR procedure will be described. Specifically, (1) the operation of the terminal 200 when detecting a beam failure, (2) the operation of the terminal 200 when making a BFR request, (3) the operation of the terminal 200 when determining the completion of BFR, ( 4) The operation of the terminal 200 when the BFR procedure fails, and (5) the operation of the terminal 200 when the beam failure is detected simultaneously in a plurality of SCells will be described.

上述したように、端末200は、BFR要求において、dedicated SR-like PUCCHを用いて、ビーム障害の発生を通知することにより、スケジューリング要求を行った後、MAC CEを用いて、ビーム障害が発生したSCellの情報と新規ビームの候補とを報告する。 As described above, the terminal 200 makes a scheduling request by notifying the occurrence of a beam fault using the dedicated SR-like PUCC H in the BFR request, and then the beam fault occurs using the MAC CE. Report the SCell information and new beam candidates.

PCell、無線基地局100又は無線基地局110から指定された上りリンク。 Uplink specified by PCel l , radio base station 100 or radio base station 110.

この場合、無線基地局100は、当該SCellを非アクティブ化してもよい。また、無線基地局100は、SCellをSCell Dormant stateにしてもよい。 In this case, the radio base station 100 may deactivate the SCel l . Further, the radio base station 100 may set the SCell to the S Cell Dormant state.

このような構成により、端末200は、ネットワークの負荷増加を抑えつつ、BFR手順が完了したことを決定し得る。 With such a configuration, the terminal 200 can determine that the BFR procedure has been completed while suppressing the increase in network load.

Claims

A terminal that sets the primary cell and secondary cell at the same time.
In the secondary cell, a receiver that receives a reference signal used to detect a beam fault, and a receiver.
When the beam obstacle is detected based on the reception quality of the reference signal, the control unit that performs the recovery procedure of the beam obstacle and the control unit.
In the beam failure recovery procedure, the transmitter that reports new beam candidates and
Equipped with
The control unit determines that the beam failure recovery procedure has been completed when a new transmission is triggered in the HARQ process used to report the new beam candidate .

The terminal according to claim 1 , wherein the control unit notifies a predetermined value as quality information in the secondary cell until the recovery procedure of the beam failure is completed.

The terminal according to claim 2, wherein the quality information is a CQI in the secondary cell.

The terminal according to claim 1 , wherein the control unit stops reporting the candidate for the new beam when the control unit determines that the recovery procedure for the beam failure has been completed.

The transmitter uses MAC CE to report candidates for the new beam.
The terminal according to claim 1, wherein the control unit determines that the beam failure recovery procedure has been completed when a new transmission is triggered in the HARQ process for transmission of the MAC CE.

Steps to set the primary cell and secondary cell at the same time,
In the secondary cell, a step of receiving a reference signal used to detect a beam fault, and
When the beam failure is detected based on the reception quality of the reference signal, the step of performing the beam failure recovery procedure and the step.
In the beam failure recovery procedure, the step of reporting a new beam candidate and
In the HARQ process used to report the candidate for the new beam, when a new transmission is triggered, the step of determining that the recovery procedure of the beam failure is completed and the step.
Wireless communication methods including.

The first radio base station that forms the primary cell,
The second radio base station that forms the secondary cell,
A terminal that sets the primary cell and the secondary cell at the same time,
Equipped with
The terminal receives a reference signal used to detect a beam fault in the secondary cell from the second radio base station.
When the terminal detects the beam fault based on the reception quality of the reference signal, the terminal performs the procedure for recovering the beam fault.
The terminal reports new beam candidates in the beam failure recovery procedure.
The terminal is a wireless communication system that determines that the beam failure recovery procedure has been completed when a new transmission is triggered in the HARQ process used to report the new beam candidate.